Upgrader (5.34) - Handle unsavable characters > 4. CiviCRM 5.34 upgrade triggers the database... * Depending on whether `CIVICRM_CRED_KEYS` is set, the upgrader... `CIVICRM_SITE_KEY`, and whether `mcrypt... ...encourage the sysadmin to setup `CIVICRM_CRED_KEYS`